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Description of Business and Summary of Significant Accounting Policies (Finite-lived Intangible Assets) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Document Period End Date Mar. 31, 2015    
Finite-lived intangible assets, gross $ 85,308,000us-gaap_FiniteLivedIntangibleAssetsGross   $ 86,301,000us-gaap_FiniteLivedIntangibleAssetsGross
Finite-lived intangible assets, accumulated amortization (38,433,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (36,930,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-lived intangible assets, net 46,875,000us-gaap_FiniteLivedIntangibleAssetsNet   49,371,000us-gaap_FiniteLivedIntangibleAssetsNet
Amortization of Acquired Intangible Assets 1,800,000us-gaap_AmortizationOfIntangibleAssets 1,900,000us-gaap_AmortizationOfIntangibleAssets  
Customer Relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross 65,992,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		   66,783,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Customer Relationships [Member] | Minimum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 7 years    
Customer Relationships [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 20 years    
Developed technology [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross 15,476,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		   15,664,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Developed technology [Member] | Minimum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 3 years    
Developed technology [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 12 years    
Trademarks [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross 2,733,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember		   2,751,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Trademarks [Member] | Minimum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 3 years    
Trademarks [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 15 years    
Non-compete agreements [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross 755,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		   751,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Non-compete agreements [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 5 years    
Backlog [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross 140,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember		   140,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
Database [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible assets, gross 212,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember		   212,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
Database [Member] | Maximum [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Finite-lived intangible asset, useful life 10 years    
Customer/territorial relationships [Member]      
Finite-Lived and Indefinite-Lived Intangible Assets [Line items]      
Indefinite-lived intangible assets $ 30,887,000us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		   $ 30,887,000us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember